Air ventilation unit for a van



FIG. 1 is a top perspective view of an air ventilation unit for a van showing my new design;

FIG. 2 is a front elevational view thereof, the rear being substantially a mirror image;

FIG. 3 is a side elevational view thereof, the side opposite being plain and unornamented; and,

FIG. 4 is a top plan view thereof.

The broken-line showing of portions of a van are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an air ventilation unit for a van, as shown and described. 